1. Unalakleet Case Study Greg Price Regional Director, West March 2011

2. ©2009. Northern Power Systems. All Rights Reserved. Not to be used or shared without permission. Proprietary and Confidential. Northwind 100 Turbine Direct Drive (Gearless) Architecture Permanent Magnet Generator (synchronous) Full Power Converter Optimized for Remote Rugged Conditions SmartView® Monitoring CSA, CE, UL1741/IEEE 1547 Cert’s 3 rd Party Verified Power Curve & Acoustics Low Maintenance/High Reliability System Design A Turbine Truly Designed for Wind Diesel

3. ©2009. Northern Power Systems. All Rights Reserved. Not to be used or shared without permission. Proprietary and Confidential. Northern Power System’s 100kW AK Fleet Over 10 years of continual operation 37 turbines currently in operation ≈ 420, 000 hours of operation Over 10 million kilowatt hours generated Growing 2011-2012 pipeline 4 more in Emmonak being installed now

4. ©2009. Northern Power Systems. All Rights Reserved. Not to be used or shared without permission. Proprietary and Confidential. Remote locations Weather Complex logistics Soft electrical grids Poor soils Complex foundations Low temperatures Icing Difficult environmental conditions Technical Challenges In Wind Diesel Projects

5. ©2009. Northern Power Systems. All Rights Reserved. Not to be used or shared without permission. Proprietary and Confidential. Project Overview Project Owner: Unalakleet Valley Electric Cooperative (UVEC) System Size: 600 KW (Northwind 100 Turbines x 6) Annual Production: 1,500,000 kWh/year Annual Fuel Savings: 113,000 gal/year Project Cost: $5.735 Million Financial Partners: Alaska Energy Authority Norton Sound Economic Development Corporation Unalakleet Native Corporation

6. ©2009. Northern Power Systems. All Rights Reserved. Not to be used or shared without permission. Proprietary and Confidential. Unalakleet System Actual Numbers >54,000 total hours of operation >950,000kWh’s generated >73,000 gallons of fuel saved <1.5 million lbs. of CO2 offset http://northernpower.kiosk-view.com/unalakleet

7. ©2009. Northern Power Systems. All Rights Reserved. Not to be used or shared without permission. Proprietary and Confidential. Project Partners FINANCIALOWNERGENERALSUBS AND SUPPLIERS ADDITIONAL STAKEHOLDERS AND PROJECT CONTRIBUTORS

8. ©2009. Northern Power Systems. All Rights Reserved. Not to be used or shared without permission. Proprietary and Confidential. Project Timeline Grant Award Announced Project Scope Revised Project Execution Begins Construction Begins Construction Complete September 2008 January 2009 April 2009May 2009July 2009 September 2009 http://www.youtube.com/watch?v=Uajq9PyzqAU

9. ©2009. Northern Power Systems. All Rights Reserved. Not to be used or shared without permission. Proprietary and Confidential. NPS Secondary Load Control Installed in January 2010 Dispatch controls automated in Spring 2010 Special control interface to give AEA’s PLC direct control of boiler power level (bias level), versus our SLC Allows for higher penetration Secondary boiler load to school gym and offices Uses zero/crossing solid state relays for switching boiler elements Boiler load is fast and electronically quiet Interfaces with NPS SmartView

10. ©2009. Northern Power Systems. All Rights Reserved. Not to be used or shared without permission. Proprietary and Confidential. Training of Native Technicians

11. ©2009. Northern Power Systems. All Rights Reserved. Not to be used or shared without permission. Proprietary and Confidential. Working Together to Create Local Jobs AVTEC DOE/NREL Alaska Wind Working Group, AWWG University of Alaska - WiDAC Alaska Center for Energy and Power Rural Energy Alaska Project, REAP

12. ©2009. Northern Power Systems. All Rights Reserved. Not to be used or shared without permission. Proprietary and Confidential. Unalakleet’s New Skyline

13. ©2009. Northern Power Systems. All Rights Reserved. Not to be used or shared without permission. Proprietary and Confidential. Use Correct Equipment for Application Employ Strong Regional Partner Search for Turnkey Solutions Providers Train Local Technicians Synchronize Multiple Projects within Regions Use Remote Energy Management Software Prepare For Environmental Difficulties Technical Solutions For Wind Diesel Projects

14. ©2009. Northern Power Systems. All Rights Reserved. Not to be used or shared without permission. Proprietary and Confidential. Wind Diesel Market Success: How To….. Subsidies, Subsidies, Subsidies State, Federal, Utility, Oil & Gas, wherever Find and Create Leadership & Champions Streamlined Grant Process Streamlined Permitting Process Native Empowerment Training, Jobs, Direct Fuel Savings, Pride